<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
	</body>
	<script type="text/javascript">
		var arr = [4,5,2,3,7];
		var arr2 = arr;
		
		arr2[3]="夏明";
		arr[0]=" 哈哈";
		
		console.log(arr)
		console.log(arr2)
		
		
	</script>
</html>
